Method of Getting Energy Level of Communication Channel

1. A method of getting an energy level of a communication channel including scanning an energy level from a first channel having a smallest number to a final channel having a largest number of a plurality of communication channels having numbers sequentially increased one by one in a direction in which a frequency is increased or reduced, in an energy detection frequency region, the method comprising: (A) setting the first channel as a subject channel; (B) performing energy detection scanning of the subject channel; (C) comparing the energy level obtained in step (B) with an energy threshold of a wireless LAN network; (D) storing the obtained energy level when the obtained energy level is larger than the energy threshold of the wireless LAN network as a result of the comparison in step (C); (E) setting the subject channel in step (D) as a completion channel; (F) setting a channel having a channel number larger than that of the completion channel set in step (E) by 3 as a subject channel; (G) performing energy detection scanning of the subject channel set in step (F); (H) comparing the energy level obtained in step (G) with the energy threshold of the wireless LAN network; (I) storing the obtained energy level when the obtained energy level is larger than the energy threshold of the wireless LAN network as a result of the comparison in step (H); (J) setting a channel having a channel number larger than that of the subject channel of the previous step by 1 as a subject channel; and (K) feeding back to step (B) when the channel number of the subject channel of the previous step is smaller than that of the final channel, and completing the method when the channel number of the subject channel of the previous step is larger than that of the final channel.

2. The method according to claim 1 , further comprising: as a result of the comparison in step (C), when the obtained energy level is smaller than the energy threshold of the wireless LAN network, (C′) comparing the energy level obtained in step (B) with an energy threshold of a Zigbee network; and (D′) storing the obtained energy level when the obtained energy level is larger than the energy threshold of the Zigbee network as a result of the comparison of step (C′), and then, step (J) is performed.

3. The method according to claim 2 , wherein, as a result of the comparison in step (C′), when the obtained energy level is smaller than the energy threshold of the Zigbee network, step (D′) is not performed, and step (J) is performed.

4. The method according to claim 1 , further comprising: as a result of step (H), when the obtained energy level is smaller than the energy threshold of the wireless LAN network, (H′) comparing the energy level obtained in step (G) with the energy threshold of the Zigbee network; (I′) storing the obtained energy level when the obtained energy level is larger than the energy threshold of the Zigbee network as a result of the comparison in step (H′); (J′) setting a channel having a channel number smaller than that of the subject channel of the previous channel by 1 as a subject channel; (K′) comparing the channel number of the subject channel set in step (J′) with the channel number of the completion channel; and (L′) comparing the channel number of the subject channel with the channel number of the final channel when the channel number of the subject channel is larger than that of the completion channel as a result of the comparison in step (K′), wherein, when the channel number of the subject channel is smaller than that of the final channel, the method is fed back to step (G), and when the channel number of the subject channel is larger than that of the final channel, the method is terminated.

5. The method according to claim 4 , further comprising: as a result of the comparison in step (K′), when the channel number of the subject channel is smaller than that of the completion channel, (K″) setting a channel having a channel number larger than that of the subject channel by 4 as a subject channel, and then, step (K) is performed.

6. The method according to claim 1 , wherein the channel in which the energy level is stored is determined as a channel in use of the wireless LAN network.

7. The method according to claim 2 , wherein the channel in which the energy level is stored in step (D′) is determined as a channel in use of the Zigbee network.

8. The method according to claim 4 , wherein the channel in which the energy level is stored in step (I′) is determined as a channel in use of the Zigbee network.

9. A method of getting an energy level of a communication channel including scanning an energy level from a first channel having a smallest number to a final channel having a largest number of a plurality of communication channels having numbers sequentially increased one by one in a direction in which a frequency is increased or reduced, in an energy detection frequency region, the method comprising: skipping two channels and performing energy detection scanning when an energy level higher than an energy threshold of a wireless LAN network is detected during a process of sequentially performing the energy detection scanning according to channels, and comparing the obtained energy level with the energy threshold of another type wireless network in response to the energy level obtained in scanning being smaller than the energy threshold of the wireless LAN network.

10. A method of getting an energy level of a communication channel including scanning an energy level from a first channel having a smallest number to a final channel having a largest number of a plurality of communication channels having numbers sequentially increased one by one in a direction in which a frequency is increased or reduced, in an energy detection frequency region, the method comprising: (A) setting the first channel as a subject channel; (B) performing energy detection scanning of the subject channel; (C) comparing the energy level obtained in step (B) with an energy threshold of a wireless LAN network; (D) storing the obtained energy level when the obtained energy level is larger than the energy threshold of the wireless LAN network as a result of the comparison in step (C); (E) setting the subject channel in step (D) as a completion channel; (F) setting a channel having a channel number larger than that of the completion channel set in step (E) by 3 as a subject channel; (G) performing energy detection scanning of the subject channel set in step (F); (H) comparing the energy level obtained in step (G) with the energy threshold of the wireless LAN network; (I) storing the obtained energy level when the obtained energy level is larger than the energy threshold of the wireless LAN network as a result of the comparison in step (H); (J) setting a channel having a channel number larger than that of the subject channel of the previous step by 1 as a subject channel; and (K) feeding back to step (B) when the channel number of the subject channel of the previous step is smaller than that of the final channel, and completing the method when the channel number of the subject channel of the previous step is larger than that of the final channel, and as a result of the comparison in step (C), when the obtained energy level is smaller than the energy threshold of the wireless LAN network, (C′) comparing the energy level obtained in step (B) with an energy threshold of a Zigbee network; and (D′) storing the obtained energy level when the obtained energy level is larger than the energy threshold of the Zigbee network as a result of the comparison of step (C′) are performed, and then, step (J) is performed, and as a result of the comparison in step (C′), when the obtained energy level is smaller than the energy threshold of the Zigbee network, step (D′) is not performed, and step (J) is performed.

11. The method according to claim 10 , further comprising: as a result of step (H), when the obtained energy level is smaller than the energy threshold of the wireless LAN network, (H′) comparing the energy level obtained in step (G) with the energy threshold of the Zigbee network; (I′) storing the obtained energy level when the obtained energy level is larger than the energy threshold of the Zigbee network as a result of the comparison in step (H′); (J′) setting a channel having a channel number smaller than that of the subject channel of the previous channel by 1 as a subject channel; (K′) comparing the channel number of the subject channel set in step (J′) with the channel number of the completion channel; and (L′) comparing the channel number of the subject channel with the channel number of the final channel when the channel number of the subject channel is larger than that of the completion channel as a result of the comparison in step (K′), wherein, when the channel number of the subject channel is smaller than that of the final channel, the method is fed back to step (G), and when the channel number of the subject channel is larger than that of the final channel, the method is terminated.

12. The method according to claim 11 , further comprising: as a result of the comparison in step (K′), when the channel number of the subject channel is smaller than that of the completion channel, (K″) setting a channel having a channel number larger than that of the subject channel by 4 as a subject channel, and then, step (K) is performed.